villus /vil·lus/ (vil´us) pl. vil´li [L.] a small vascular process or protrusion, especially from the free surface of a membrane.
arachnoid villi
villus [vil´us] (L.)
arachnoid villi
1. microscopic projections of the arachnoid into some of the venous sinuses.
chorionic villus one of the threadlike projections growing in tufts on the external surface of the chorion.
intestinal villi multitudinous threadlike projections covering the surface of the mucous membrane lining the small intestine, serving as the sites of absorption of fluids and nutrients. 
)
Intestinal villus.
synovial villi slender projections of the synovial membrane from its free inner surface into the joint cavity.
arachnoid villi
U.S., pl.
Etymology: Gk, arachne, spider, villus, shaggy hair
one of the many projections of fibrous tissue from the arachnoid membrane.
villus [vil´us] (L.)
a small vascular process or protrusion, as from the free surface of a membrane.
arachnoid villi microscopic projections of the arachnoid into some of the venous sinuses.
chorionic villi see chorionic villi.
intestinal villi multitudinous threadlike projections covering the surface of the mucous membrane lining the small intestine, serving as the sites of absorption of fluids and nutrients.
synovial villi slender projections from the surface of the synovial membrane into the cavity of a joint; called also haversian glands.
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